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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e8f830373a1003563eee4cd7053de5764470b4c9a5bd29f937c8f7caa8f856' 
  AND token = 'MfDssB8AempYThpr0IKPuI6goKoeqtIO4oH8zwqtgY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}